#coding:utf-8


class Handler:
    def successor(self, successor):
        self.successor = successor


class ConcreteHandler1(Handler):
    def handle(self, request):
        if request > 0 and request <= 10:
            print('in handler1')
        else:
            self.successor.handle(request)    # 调用其他类方法


class ConcreteHandler2(Handler):
    def handle(self, request):
        if request > 10 and request <= 20:
            print('in handler2')
        else:
            self.successor.handle(request)    # 调用其他类方法


class ConcreteHandler3(Handler):
    def handle(self, request):
        if request > 20 and request <= 30:
            print('in handler3')
        else:
            print('end of chain, no handler for {}'.format(request))


class Clinet:
    def __init__(self):
        h1 = ConcreteHandler1()
        h2 = ConcreteHandler2()
        h3 = ConcreteHandler3()
        h1.successor(h2)
        h2.successor(h3)
        requests = [2, 5, 23, 11, 18, 3, 35, 27, 20]
        for request in requests:
            h1.handle(request)


if __name__ == '__main__':
    client = Clinet()
